Question: which flammable gas with the minimal lethal dose whose has effect of arsine exposure?
Paraphrase: Which gas is flammable, and with minimal doseage has effects of arsine exposure?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q21073026 . ?ent wdt:P2300 ?obj . ?ent wdt:P1542 wd:Q21167853. } ORDER BY ASC(?obj)LIMIT 5